Avoid failing when embedding with a Window id of 0

I'd like to let st run with its own window when trying to embed it to a window with id 0 instead of exiting with an error.
added .gitignore file
symlinked config.def.h to config.h
initial commit of my config.def.h
default font is now DejaVu Sans Mono for Powerline
switched to zenburn colortheme